Conditions for the oscillation of solutions of iterative equations. Nowakowska, Wiesława; Werbowski, Jarosław — 2004 Abstract and Applied Analysis
Oscillations of all solutions of functional differential inequalities Jarosław Werbowski — 1986 Czechoslovak Mathematical Journal
Note on the asymptotic behavior of the solutions of differential equations with deviating arguments Jarosław Werbowski — 1978 Mathematica Slovaca
Oscillation of linear functional equations of higher order W. Nowakowska; Jarosław Werbowski — 1995 Archivum Mathematicum The paper contains sufficient conditions under which all solutions of linear functional equations of the higher order are oscillatory.